| A body of weight 32 lb is dropped from rest from height 100ft in a medium offering an air resistance proportional to velocity.
If limiting velocity is 400 ft/sec, find the velocity and displacement at any time. Find the time at which velocity is 200ft/sec
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答えは v=400(1-[e^(-2t/25)])
x=100+400t-5000(1-[e^(-2t/25)])
v=200 when t=25(log√2)
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